We are looking for a **Senior Systems Development Specialist – Java** to work in a payment ecosystem, developing **evolutionary and corrective projects**, while ensuring high performance, scalability, and security. If you have experience in **payment methods**, especially in the card industry, and want to work in an innovative environment, this opportunity is for you! **Responsibilities and duties** * Develop and enhance systems of the **card processing platform** using **Java and Spring**. * Implement and optimize **microservices** in **Kubernetes** and **AWS** environments. * Work with **relational and non-relational databases**, ensuring high availability and performance. * Develop and maintain **data streaming** solutions. * Implement and manage **distributed caching**. * In-depth knowledge of financial products, especially in the card industry. * Participate in **architecture definition** and strategic solution decisions. * Provide technical leadership to development teams, promoting best practices and quality standards. * Interact with **internal and external stakeholders**, ensuring technical and strategic alignment. **Requirements and qualifications** Solid experience with **Java, Spring, Kubernetes, and AWS**. Advanced knowledge of **microservices, APIs, PCI DSS, and payment security**. Experience with **financial products, especially in the card industry**. Proficiency in **relational and non-relational databases**. Experience in **data streaming** using **MQ Series, RabbitMQ, or Kafka**. Prior experience in the **card industry** (authorization, reconciliation, security, etc.). **Additional information** On-site position in Barueri Fluency in **English**. Experience with **event-driven architecture**. Experience in **cloud migration projects**. **EXPLORE OUR OPPORTUNITIES** **What CSU Digital does** We are a team of over 4,000 people building innovative, technology-driven solutions for payments, customer experience, and customer loyalty and engagement. Since 1992, we have integrated and connected financial institutions, retailers, service providers, and consumers across Brazil. As pioneers, we continuously launch products and solutions that transform and simplify the daily lives of thousands of people. **Solutions Portfolio** **** **Building a career here** Pioneering spirit and innovation drive us to seek creative and differentiated solutions. We value meritocracy and recognize talent, providing professional development and growth opportunities for our employees. For us, ethics is a fundamental principle, enabling us to build strong and lasting relationships with our stakeholders. We believe commitment focused on sustainable results, and customer and employee satisfaction, is the key to success. **Our greatest pride** Watching our employees grow and develop alongside CSU fills us with pride. Each success story, evolution, and overcoming challenge demonstrates how our professionals’ dedication and partnership with the company can transform lives, businesses, and society.